1) I think you are clearly getting the better end with Letang and Shat, but seems unlikely to be accepted.
2) This is the most probable scenario IMO, and if you can afford to lose Backstrom, do it. In the long run this could be overpaying.
3) His is ok too, but Yandle has not been impressive at all, so a bit risky.
4) This trade I would never accept if I had Shattenkirk...
ESPN 12-Team H2H Points
C(2) LW(2) RW(2) D(4) UTL(3) G(2) B(10) IR(3)
G(4) A(2) +/-(1) PIM(.25) SHG(2) SHA(1) GWG(3) HAT(8) HIT(.25) BLK(.25) DEF(1) PPP(1)
W(5) L(-2) SA(.1) GA(-1) SV(.2) SO(5) OTL(2)
C: Crosby, Tavares, Giroux, Draisaitl, MacKinnon, Marchessault
LW: Simmonds, Schwartz, Vanek, E. Kane, Larkin, Zucker
RW: Eberle, Stone, Carter, Laine
D: Shattenkirk, Pietrangelo, Carlson, Byfuglien, Ellis
G: Allen, Talbot, Lehtonen, Mason